Capillary pressure measuring online real-time flow metering system and method for electric pump well

Abstract

The invention belongs to the field of oil exploitation, and relates to a capillary pressure measuring online real-time flow metering system and method for an electric pump well. The real-time flow metering system comprises an oil-submerged pump, an oil-submerged motor, a pressure stabilizing cylinder, a control cabinet, a ground data collecting and analyzing system, a wellhead casing pressure measuring device, a wellhead oil pressure measuring device, a wellhead temperature measuring device and a capillary pressure measuring system ground device. The control cabinet is used for supplying power to the oil-submerged motor through a cable. The pressure stabilizing cylinder is connected to the position, at a certain distance, of the lower end of the oil-submerged motor and is connected with the capillary pressure measuring system ground device through a capillary. The ground data collecting and analyzing system is used for collecting and storing wellhead oil pressure, casing pressure, temperature, fluid column pressure at the pressure stabilizing cylinder and ground current and voltage and calculating and displaying the flow of the electric pump well in real time. According to the capillary pressure measuring online flow real-time metering system and method for the electric pump well, it is only needed to install an underground capillary single-point pressure measuring device and a wellhead pressure and temperature measuring device, and online real-time flow metering of the electric pump well is achieved in combination with a power balance method and a wellbore multi-phase flow metering method.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and in particular relates to a real-time metering system and method for the online flow rate of an electric pump well by capillary piezometry. Background technique [0002] With the improvement of the metering level of electric pump wells in oil fields, two-phase or three-phase flowmeters are used for production metering, but their high cost restricts the large-scale application of flowmeters. In recent years, the construction of "smart oilfields" has promoted the demand and development of automated metering. The method is to use an automatic device to collect data related to oil well production in real time, and then perform real-time and online liquid volume measurement with the help of a mathematical model. This method is low in cost, high in accuracy, and can realize remote measurement, and is especially suitable for production measurement of remote wells and offshore wells. [0003] I...

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Problems solved by technology

[0003] In 2011, SCHLUMBERGER announced a method for calculating the flow rate of electric pump wells based on the power balance method (US20110088484A1). This method requires the installation of a set of electric pump companions to collect data such as downhole pump inlet pressure, pump inlet temperature, and pump outlet pressure. In addition, in the calculation process of this method, the motor power factor and motor efficiency are treated as constants, which has a certain gap with the actual production

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